/* style.css */

/* --- 全局样式 --- */
:root {
    --primary-color: #5a4628; /* 深棕色，用于标题和重点 */
    --secondary-color: #c8a464; /* 金色，用于按钮和装饰 */
    --background-color: #fdf6e3; /* 米黄色背景，类似宣纸 */
    --card-bg-color: #fffaf0; /* 卡片背景，稍白一些 */
    --text-color: #3d3d3d; /* 主要文字颜色 */
    --border-color: #e0d5c1; /* 边框颜色 */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.7;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

h1, h2, h3 {
    color: var(--primary-color);
    font-weight: 600;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--primary-color);
}

/* --- 头部导航 --- */
header {
    background-color: var(--card-bg-color);
    border-bottom: 2px solid var(--border-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo {
    font-size: 1.8em;
    font-weight: bold;
    color: var(--primary-color);
}

nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    gap: 25px;
}

nav a {
    color: var(--primary-color);
    font-weight: 500;
    font-size: 1.1em;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
}

nav a.active, nav a:hover {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
}

/* --- 主要内容 --- */
main {
    padding: 40px 0;
}

section {
    margin-bottom: 60px;
}

.section-title {
    text-align: center;
    font-size: 2.2em;
    margin-bottom: 40px;
}

/* --- 按钮 --- */
.btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: #fff;
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: bold;
    text-align: center;
    transition: background-color 0.3s, transform 0.2s;
}

.btn:hover {
    background-color: var(--primary-color);
    color: #fff;
    transform: translateY(-2px);
}

/* --- 首页特定样式 --- */
.hero {
    text-align: center;
    padding: 60px 20px;
    background-color: var(--card-bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 2.8em;
    margin-bottom: 15px;
}

.hero p {
    font-size: 1.2em;
    max-width: 700px;
    margin: 0 auto 30px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-item {
    background-color: var(--card-bg-color);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.feature-item h3 {
    margin-top: 0;
}

/* --- 内容页面通用样式 (关于, 隐私政策) --- */
.content-page {
    background-color: var(--card-bg-color);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.content-page h1 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 30px;
}
.content-page h2 {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
    margin-top: 40px;
}

/* --- 页脚 --- */
footer {
    background-color: var(--primary-color);
    color: #f0e6d2;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

footer a {
    color: #fff;
}

/* --- 响应式设计 --- */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .hero h1 {
        font-size: 2.2em;
    }

    .hero p {
        font-size: 1em;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .download-buttons {
        flex-direction: column;
    }

    .content-page {
        padding: 20px;
    }
}